Symbiosis of Marshes and Permafrost in Da and Xiao Hinggan Mountains in Northeastern China  

作　　者：JIN Huijun SUN Guangyou YU Shaopeng JIN Rui HE Ruixia 

机构地区：[1]State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [2]Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China [3]Department of Geography, Harbin College, Harbin 150086, China

出　　处：《Chinese Geographical Science》2008年第1期62-69,共8页中国地理科学（英文版）

基　　金：Under the auspices of National Natural Science Foundation of China (No. 40701031,40225001,J0630966);3rd-term Knowledge Innovation Program of Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences (No. O650445)

摘　　要：Recently, the degradation of permafrost and marsh environments in the Da and Xiao Hinggan Mountains has become a great concern as more human activities and pronounced climate warming were observed during the past 30 years and projected for the near future. The distr/bution patterns and development mechanisms of the permafrost and marshes have been examined both in theories and in field observations, in order to better understand the symbiosis of permafrost and marshes. The permafrost and marshes in the Da and Xiao Hinggan Mountains display discernible zonations in latitude and elevation. The marsh vegetation canopy, litter and peat soil have good thermal insulation properties for the underlying permafrost, resulting in a thermal offset of 3 ℃ to 4℃ and subsequently suppressing soil temperature. In addition, the much higher thermal conductivity of frozen and ice-rich peat in the active layer is conducive to the development or in favor of the protection of permafrost due to the semi-conductor properties of the soils overlying the permafrost. On the other hand, because permafrost is almost impervious, the osmosis of water in marsh soils can be effectively reduced, timely providing water supplies for helophytes growth or germination in spring. In the Da and Xiao Hinggan Mountains, the permafrost degradation has been accelerating due to the marked climate warming, ever increasing human activities, and the resultant eco-environmental changes. Since the permafrost and marsh environments are symbiotic and interdependent, they need to be managed or protected in a well-coordinated and integrated way.Recently,the degradation of permafrost and marsh environments in the Da and Xiao Hinggan Mountains has become a great concern as more human activities and pronounced climate warming were observed during the past 30 years and projected for the near future.The distribution patterns and development mechanisms of the permafrost and marshes have been examined both in theories and in field observations,in order to better understand the symbiosis of permafrost and marshes.The permafrost and marshes in the Da and Xiao Hinggan Mountains display discernible zonations in latitude and elevation.The marsh vegetation canopy,litter and peat soil have good thermal insulation properties for the underlying permafrost,resulting in a thermal offset of 3℃ to 4℃ and subsequently suppressing soil temperature.In addition,the much higher thermal conductivity of frozen and ice-rich peat in the active layer is condu-cive to the development or in favor of the protection of permafrost due to the semi-conductor properties of the soils overlying the permafrost.On the other hand,because permafrost is almost impervious,the osmosis of water in marsh soils can be effectively reduced,timely providing water supplies for helophytes growth or germination in spring.In the Da and Xiao Hinggan Mountains,the permafrost degradation has been accelerating due to the marked climate warming,ever increasing human activities,and the resultant eco-environmental changes.Since the permafrost and marsh envi-ronments are symbiotic and interdependent,they need to be managed or protected in a well-coordinated and integrated way.

关 键 词：marsh PERMAFROST SYMBIOSIS thermal offset active layer Da and Xiao Hinggan Mountains 

分 类 号：P343.4[天文地球—水文科学]